Synthetic Oil Recommendation for Buick

Issue / Question:
Do you recommend synthetic oil? What about adding a synthetic oil to gas? How much?

Answer:
Yes Amsoil 0-W-30 for the engine change it once a year or every 10,000 mile.

Many of our customers use the Amsoil 100 to 1 Synthetic outboard oil as a fuel additive! They periodically use 1 ounce to each 5 gallon. It adds upper end lubrication and helps prevent phase separation of ethanol fuels, their pay back is usually another 1 to 1 1/2 more miles to the gallon.